Internally cured concrete for pavement and bridge deck applications.
-
2015-07-01
Details:
-
Creators:
-
Corporate Creators:
-
Corporate Contributors:
-
Subject/TRT Terms:
-
Publication/ Report Number:
-
Resource Type:
-
Geographical Coverage:
-
Corporate Publisher:
-
Abstract:A laboratory and field testing program was conducted to evaluate the performance and usability of internally
cured concrete (ICC) using lightweight aggregates for bridge decks and concrete pavement slabs under Florida
conditions. The laboratory testing program evaluated three standard mixes (SM) and three corresponding ICC mixes
with the same water-cementitious (w/c) ratios and cementitious materials contents. The ICC mixes were produced
by replacing a part of the fine aggregate with a pre-wetted lightweight aggregate (LWA). The quantity of LWA used
was an amount that would supply 7 lb of absorbed water per 100 lb of cementitious materials used. The amounts of
water-reducing admixtures needed for the ICC mixes to achieve the same workability of the fresh concrete were less
than those for the standard mixes with the same w/c ratios. The compressive strength, flexural strength, elastic
modulus, splitting tensile strength, and coefficient of thermal expansion of the ICC mixes were lower than those of
the standard mixes with the same w/c ratio. The ICC mixes showed substantially greater resistance to shrinkage
cracking than the standard mixes as observed from the results of the restrained shrinkage ring test.
Two ICC test slabs and one SM test slab were constructed to evaluate the performance of ICC in pavement
slabs. The results of the critical stress analysis showed that at a critical loading condition, the computed stress-to-
strength ratios for the ICC slabs were lower than that for the SM slab. Visual inspection of the SM slab after heavy
vehicle simulator (HVS) loading showed that some hairline cracks could be seen next to the wheel path. These
hairline cracks could be caused when micro shrinkage cracks developed into hairline cracks after the slab was loaded
repetitively by the HVS wheel load. No visible cracks were observed from the two ICC test slabs.
Based on the results of the critical stress analysis and the visual inspection of the three test slabs, the ICC test
slabs appeared to have better performance than the standard-mix slab. A field testing program to further assess the
performance and benefits of ICC mixes in bridge deck and pavement applications is recommended
-
Format:
-
Collection(s):
-
Main Document Checksum:
-
File Type:
Supporting Files
-
No Additional Files
More +